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. 2011 Mar;37(3-2):493–501. doi: 10.1016/j.ultrasmedbio.2010.11.010

Fig. 1.

Fig. 1

Plot of L against α for a weakly focused ultrasound beam with low contrast penetration L0 and a minimum beam width D0. α is the reciprocal of beam width, and L(α′) corresponds to the depth range over which the beam width is less than 1/α′. The resolution integral R is equal to the area under the curve.